科研之友
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摘要
Every year, a large number of construction scrap wood and industrial processing residues are generated, not only caused heavy pressure on the environment, also the natural biological active ingredient in larch wood is wasted. In order to solve this urgent problem, the dynamic distribution and biological storage analysis of procyanidins, arabinogalactan and dihydroquercetin extracted by ultrasound-assisted extraction (UAE) in different parts of larch wood was studied. The results show That pith and sapwood have the highest and lowest moisture content, respectively. Moisture content also exhibited an increase from outer to inner heartwood. However; moisture content tended to decrease from 13.11 to 6.99% with increasing latitude. Most PCs were exclusively distributed in the bark and sapwood. The PC content of bark was about 10-20 times higher than that in sapwood, which increased with latitude increasing in bark. The highest PC content was 601.94mg/g at 14 m height. AG content in the outer heartwood and sapwood was higher, and was lower in pith. Bark contained almost no AG. AG content was increased with the latitude increasing; and the highest content of AG was found at 6 m in sapwood. The peak of DHQ content in outer heartwood was 31.58 mg/g at the ground 0 m, where it was lower in mid- and inner heartwood than that in outer heartwood, and was lowest in bark (0.08 mg/g). Two peaks of DHQ content were observed with increasing latitude (at 0 and 6 m, respectively).
